SPN 2646 FMI 4 is the Detroit DD Series diagnostic trouble code for digital output 4-02 short to ground on cpc4 #4 connector, and this page documents the 1-page fault-code PDF for it. It gives mechanics the monitored conditions, the step-by-step troubleshooting sequence and the CPC4 digital output circuit checks needed to diagnose the fault. The full document is a Detroit fault code sheet built from Detroit Power Service Literature references.
Official document details
| Brand | Detroit (Detroit Diesel / DTNA) |
| Model coverage | DD13, DD15 and DD16 |
| System / Group | DD Series (EPA 2007-Current) / DTCs — CPC4 digital output circuit |
| Suspect Parameter Number | 2646 |
| Failure Mode Identifier | 4 |
| Fault description | Digital Output 4-02 Short To Ground On CPC4 #4 Connector |
| Year / Emissions | GHG14 |
| Pages | 1 |
| File size | 0.22 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code header: SPN and FMI identification
- Troubleshooting steps
- Component removal references (Detroit Power Service Literature)
- Verification and clearing the code
SPN 2646 FMI 4 diagnostic overview
This code indicates digital output 4-02 is shorted to ground on pin 02 of the Common Powertrain Controller (CPC4) #4 connector. Because CPC4 outputs share SPNs with MCM2.1 faults, the diesel diagnostic tool distinguishes the two; steps verify the PGR035 digital output parameters first. Reading SPN 2646 FMI 4 correctly stops parts being replaced before the wiring and mechanical checks are done.
Applicable truck models
This Detroit DD Series fault code sheet applies to the DD13, DD15 and DD16 engines in the DD Series (EPA 2007-Current) family, covering GHG14 configurations, and the same code also appears in Detroit Series 60 DDEC VI listings. Component removals point to Detroit Power Service Literature, and unresolved cases route to the Detroit Customer Support Center at 800-445-1980. Verify engine and emissions level against your build on the official Detroit brand site before ordering parts.
Who needs this 2646 FMI 4 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators running Detroit DD engines use this CPC4 digital output circuit sheet with a diesel diagnostic tool to work the fault methodically instead of guessing.
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